Cheat Mode
Turn on second controller (if you have one) sign in as guest. Same input goes if on PS2:
[L1], [L1], [R1], [L1], [L1], [L1], [R1], [R1] - All Clothes (Game slows down until another button is pressed).
Hold [L1] and press [Up], [Left], [Down], [Down], [Triangle], [Square], [X], [X] - All gym grapple moves (not shown in stats).
Hold [L1] and press [Up], [Left], [Down], [Right], [Triangle], [Square], [X], [Circle] - All Hobo fighting moves (not shown in stats).
Hold [L1] and press [R2], [R2], [R2] - Full Health (not kissing level).
Hold [L1] and press [Up], [Up], [Up], [Up] - Have All Weapons.
Hold [L1] and press [Up], [Down], [Up], [Down] - Infinite Ammo Toggle.
Hold [L1] and press [Triangle], [Square], [Circle], [X] - Massive Money Gain.
Hold [L1] and press [Up], [Up] - Refill Ammo to Max Capacity.